Question

Make an Arduino device that detects light levels and causes a change in pitch on a piezo depending on the proximity of the light to the sensor.

I'm struggling to produce the code that is needed. Here is what I have but it isn't right at all and isn't working...

const int dark = 340; //set dark parameters
const int sound = 60; //set noise to play

void setup() {
pinMode(3, OUTPUT);
pinMode(A0, INPUT);
Serial.begin(9600); }
  
void loop() {
int light = analogRead(A0);
  
if (light < dark) {
Serial.print(light);
Serial.println(" It's dark");
}
else {
Serial.print(light);
}
  
Serial.println(" It's light");
tone(3, sound, 10);

}

Answer 1

Make an Arduino device that detects light levels and causes a change in pitch on a piezo depending on the proximity of the light to the sensor.

#define trigPin 7
#define echoPin 6
#define led 13
#define led2 12
#define led3 11
#define led4 10
#define led5 9
#define led6 8
#define buzzer 3

int sound = 250;


void setup() {
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(led, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
pinMode(led6, OUTPUT);
pinMode(buzzer, OUTPUT);

}

void loop() {
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;


if (distance <= 30) {
    digitalWrite(led, HIGH);
    sound = 250;
}
else {
    digitalWrite(led,LOW);
}
if (distance < 25) {
      digitalWrite(led2, HIGH);
      sound = 260;
}
else {
      digitalWrite(led2, LOW);
}
if (distance < 20) {
      digitalWrite(led3, HIGH);
      sound = 270;
}
else {
    digitalWrite(led3, LOW);
}
if (distance < 15) {
    digitalWrite(led4, HIGH);
    sound = 280;
}
else {
    digitalWrite(led4,LOW);
}
if (distance < 10) {
    digitalWrite(led5, HIGH);
    sound = 290;
}
else {
    digitalWrite(led5,LOW);
}
if (distance < 5) {
    digitalWrite(led6, HIGH);
    sound = 300;
}
else {
    digitalWrite(led6,LOW);
}

if (distance > 30 || distance <= 0){
    Serial.println("Out of range");
    noTone(buzzer);
}
else {
    Serial.print(distance);
    Serial.println(" cm");
    tone(buzzer, sound);

}
delay(500);
}